Syringe



May 22, E923.

O. O. R. SCHWIDETZKY SYHINGE' Filed March 1o. 192i WIT/VESSES @wm w@ l TTURNEYS Patented May 22, T923.,

NETE@ STATES Lden@ PATENT @TTTQCO OSCAR O. R. SCHDETZKY, OF HASBROUCK HEIGHTS, NEW JERSEY, ASSIGNOR T BECTON, DTCKINSON t C0., 0F RUTI-IEREO'RD, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SYBINGE.

Application fried March 10, 1921.

To @ZZ 'whom t may concern.'

- Be it knownthat Oscar. U. R. `SCHWI- DETZKY, a citizen of the United States, and a resident of Hasbrouck Heights, in the county of Bergen and State of New Jersey, have invented a new and improved Syringe, of

which the 'following is a full, clear, and eX- act description.

rThe object of the invention is to provide a l0 new and improved syringe arranged for convenient filling and refilling with a serum or other liquid, notably one that is used for local anaesthesia or the like,

Another object is to permit of refilling the 15 syringe while the latter is applied and without danger' of admitting air or other foreign deleterious matter into the barrel of the syringe thereby preventing contamination of the fluid to be injected into the body.

Another object is to prevent the injected fluid from being withdrawn from the vein or other part of the body into the syringe during the refilling operation.

`With these and other objects in view, the invention consists of certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is reduced side eleva-tion of the improved syringe connected with a gravity supply for charging the syringe;

Figure 2 is a longitudinal central section of the syringe with the parts in position for refilling;

Figure 3 is a cross section of the same on the line 3 3 of Figure 2;

Figure L1 is a similar view of the same with the valve plunger in shut-off position relative to the inlet; and

Figure 5 is a plan view of the valve plunger.

The barrel and the plunger all mounted to slide in the barrel are preferably made of glass` and the forward end of the barrel is provided with an outlet 12 engaged by a hub 13 carrying the usual hypodermic needle rlhe barrel 10 is further provided at its side a distance from the outlet 12 with an inlet 15 connected by a piece of rubber tubing Serial No. 451,129.

1G with the lower end of a vessel 17 adapted to contain the liquid to be injected by the syringe into the body of a patient. rThe vessel 17 is provided at its upper end with a suitable clip 18 for supporting the vessel overhead to insure a gravity flow of the liq uid contained in the vessel into the barrel 10.

The plunger 11 is provided at its outer end with a suitable handle 20 to enable the operator to conveniently manipulate the plunger with a view to force the liquid out of the barrel 10 into the vein or other part by the needle 14. The outward movement of the plunger 11 in the barrel 10 is limited by a suitable stopping means such as a chain 21 attached at its ends to clips 22 and 23 held on the barrel 10 and the outer end of the plunger 11, respectively, as plainly indicated in Figure 1. The plunger 11 is preferably made hollow and closed at the ends, and on the peripheral face of the plunger 11 is formed a longitudinal groove 25 extending from the inner end of the plunger a distance rearward to render the groove of a length corresponding approximately to the distance from the forward end of the barrel 10 to the rear end of the inlet 15. When the liquid is to be ejected from the barrel 10, the plunger 11 is turned in the barrel 10 until the groove 25 is out of register with the inlet 15 (see Figure 11)', and when the plunger is now pushed forward, the liquid is forced out of the barrel, as above described, while the inflow of the liquid through the inlet 15 is cut olf by the plunger. When it is desired to refill the barrel 10 with the plunger 11 in forward position and without danger of admitting air into the barrel, the operator turns the plunger 11 until the groove 25 registers with the inlet 15. The liquid from the vessel 17 now flows by gravity through the tubing 16, the inlet 15 and the groove 25 into the forward e'nd of the barrel 10 and refills the same. After the barrel 10 has been filled with a desired amount of liquid then the operator again turns the plunger 11 to move the groove 25 out of register with the inlet 15, thus cutting o the supply of liquid to the barrel. rThe liquid in the forward end of the barrel 10 is now injected by pushing the plunger 11 inward.

From the foregoing it will be seen that by the arrangement described the needle 111 remains in position on the part of the body during the refilling. operation of the barrel l0, and a second application of 'the liquid can be quickly made Without changing the position of the syringe relative to the body. It Will alsov be noticed that air or other deleterious matter is not liable to pass into the barrel during the reiilling or ejection operations. It will further be noticed that the plunger ll besides its usual function serves as a valve to control the iniioW of the liquid from the vessel 17 into the barrel 10.

Having thus described my invention, I claim as new and desire to secure by Letters Patent l l. A syringe, comprisinfr a barrel provided Witli an outlet at one end and an inlet at the side, and a valve plunger mounted to slide andto turn in the said barrel and having means adapted to register Witli the said inlet to connect the latter With `the outlet eiid of tlie barrel, the Vsaid means on turning the valve plunger moving out or' register With the inlet. y

2. A syringe7 comprising a barrel provided at one end With an outlet and at the side With an inlet, and a plungery `mounted to slide and to turn'in the said barrel and provided at its peripheral face With a longitudinal groove extending a distance rearward from the front end of the plunger, the said groove in one position or' the plunger being in register With the said inlet and in another position of the plunger being out of register With the said inlet. y

loscAR o. R. scHWrDETZKY. 

